Overview.php

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<?php
declare(strict_types=1);

namespace Magento\Multishipping\Block\DataProviders;

use Magento\Framework\Session\SessionManagerInterface;
use Magento\Framework\View\Element\Block\ArgumentInterface;
use Magento\Quote\Model\Quote\Address;

class Overview implements ArgumentInterface
{
    private $session;

    private $addressErrors = [];

    public function __construct(
        SessionManagerInterface $session
    ) {
        $this->session = $session;
    }

    public function getAddressError(Address $address): string
    {
        $addressErrors = $this->getAddressErrors();

        return $addressErrors[$address->getId()] ?? '';
    }

    public function getAddressErrors(): array
    {
        if (empty($this->addressErrors)) {
            $this->addressErrors = $this->session->getAddressErrors(true);
        }

        return $this->addressErrors ?? [];
    }

    public function getAddressAnchorName(int $addressId): string
    {
        return 'a' . $addressId;
    }
}